I tried for 30+ years to earnestly seek Him for myself and failed. Not a shred of demonstration was ever given.
God does not do party tricks for people, if you expect Him to do that to prove Himself, than it most likely will not happen, God has probably proved Himself to you over and over again, but it was never the way you expected Him to, you lost a toe, so you should be grateful you never lost your foot. Everyone wants God to dance for them like a puppet, they pull the strings and HE does the tricks, you need to just give up demanding of Him and just let Him into your life on His terms not yours. With God it must be His way, if you want to run teh show, you will be doing it on your own.
Remember what Jesus said.
Mat_26:39 And he went a little further, and fell on his face, and prayed, saying, O my Father, if it be possible, let this cup pass from me: nevertheless not as I will, but as thou wilt.
are you willing to just hand it all over to Him??